1. Cobra Interface Mark Grady CSE 237a Spring 2004

2. Project Goals
Design a Palm Interface to download dive logs from a dive computer
Convert log information to UDCF
Adhere to Palm UI guidelines
Mark Grady CSE237a SP04

3. Tools Suunto Cobra, interface cable, SDM
Metrowerks Codewarrior (v.8 demo)
PalmOS SDK, Emulator, Simulator
Advanced Serial Port Monitor
Osciloscope, multimeter, leds, etc.
Mark Grady CSE237a SP04

4. Challenges Reverse engineer Suunto protocol
Implement non-standard serial interface using Palm API
Mimic Suunto protocol timing
5k max code size (Metrowerks demo)
Mark Grady CSE237a SP04

5. RS232 Tutorial Active low (logical 1: -3v to -12v)
Terminal (DTE) vs. Com Device (DCE)
Standard DE-9 pinout:
1 DCD
2 RxD
3 TxD
4 DTR
5 SGND
6 DSR
7 RTS
8 CTS
9 RI
Mark Grady CSE237a SP04

6. Suunto Protocol Half-Duplex, Master(PC)-Slave(DC) DTR powers cable
RTS routes data
active=DC
inactive = PC
Mark Grady CSE237a SP04

7. Suunto Protocol Master Packet: read memory Slave Packet: read memory
0x05, <addr_high>, <addr_low>, <num_bytes>, <CRC>
Slave Packet: read memory
0x05, <addr_high>, <addr_low>, <num_bytes>,<payload>,CRC
CRC is XOR of preceding bytes
1<=num_bytes<=32
Memory addressing from #0000-#1FFF
Mark Grady CSE237a SP04

8. Demo
Perform snazzy demo here
Mark Grady CSE237a SP04

9. Results
Design a Palm Interface to download dive logs from a dive computer
Convert log information to UDCF
Adhere to Palm UI guidelines
Mark Grady CSE237a SP04

10. Remaining Work Validate incoming data Convert to UDCF and export
Improve serial functionality
Support write to DC?
Mark Grady CSE237a SP04

11. Conclusions Using OTS product traded flexibility/power for convenience
Read the documentation, but remember it is rarely 100% accurate
Mark Grady CSE237a SP04